The amine is treated with benzenesulphonyl chloride and shaken with alkali solution when the three amine because in different way. Primary amine from alkyl benzesulphoramide which dissolve in alkali to from sodium potassium salt of mono alkyl benzene sulphoramide. Secondary amine from dialkali benzene, in soluble in alkali solution and tertiary amines do not react with benzene sulphonyl chloride at all.